CN1078997C - Process for transferring data packets between emulated LANs - Google Patents
Process for transferring data packets between emulated LANs Download PDFInfo
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- CN1078997C CN1078997C CN96196646A CN96196646A CN1078997C CN 1078997 C CN1078997 C CN 1078997C CN 96196646 A CN96196646 A CN 96196646A CN 96196646 A CN96196646 A CN 96196646A CN 1078997 C CN1078997 C CN 1078997C
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
- H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
- H04Q11/0478—Provisions for broadband connections
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
- H04L12/4604—LAN interconnection over a backbone network, e.g. Internet, Frame Relay
- H04L12/4608—LAN interconnection over ATM networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
- H04L2012/5614—User Network Interface
- H04L2012/5615—Network termination, e.g. NT1, NT2, PBX
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
- H04L2012/5638—Services, e.g. multimedia, GOS, QOS
- H04L2012/5645—Connectionless
Abstract
The invention concerns a process for transferring data packets between a source LEC of a first ELAN and a target LEC of a second ELAN, the process comprising the following steps: determining the target ATM address by transmitting an address-resolving enquiry of the source LEC to the second ELAN via a CLS wide-area network preparing a connectionless service and resolving the target MAC address in the second ELAN into the associated ATM address; establishing connection between the source LEC and target LEC via an ATM network, which is of a higher level than the first ELAN and the second ELAN, using the target ATM address determined; and transferring the data packets via the higher-level ATM network. In one embodiment, the ATM address determined, as the address-resolving response, is transmitted via the CLS wide-area network to the first ELAN and from there to the source LEC which establishes a connection to the target LEC.
Description
The present invention relates to a kind of at one the one ELAN (emulated LAN) a source lan emulation user (LEC) and the lan emulation user of one the 2nd ELAN between transmit the method for packets of information.
ELAN represents the LAN of emulation, for example in " about the lan emulation of ATM: version 1.0 " specification 94-0035R9 of lan emulation SWG drafting group of atm forum on January 6 nineteen ninety-five, specify like that, editor: Bill Ellington (Bill's Ellington).Relate to a consideration that current LAN is shifted to the ATM net of ATM symposium at this.ATM means " Asynchronous Transfer Mode " at this, promptly asynchronous data or information transferring method.LAN is the abbreviation of " local Area Network local area network ", is called for short regional network.What relate under the situation of LAN is the localized network of datagram-oriented, in addition, to this at David D. Clarke (David D.Clark), in general Roc orchid of Ke Neisi D. (Kenneth D.Progran) and the David P. in the article of " local area network (LAN) cross the threshold " of (David P.Reed), the IEEE compilation, 66 volumes, 11 phases, in November, 1978,1497 to 1517 pages explain.In addition, at ISO/IEC TR8802-1, in " general introduction of LAN standard " LAN is described.LAN provides a kind of business of disconnected formula, so-called MAC business.MAC represents " control of MediaAccess Control medium access ".Disconnected formula is professional opposite therewith, and atm technology is at connecting.If, then in this ATM net, must provide disconnected formula MAC performance of services for the agreement of each higher level of LAN exploitation should be applied in the emulated lan on the ATM net basis.The lan emulation of book realizes that MAC is professional and define a kind of single emulated lan thus in local ATM net as described above, hereinafter referred to as ELAN.In this ELAN, can utilize common lan protocol, for example LLC, PCP/IP, SPX/IPX or TP/CLNP.
Two kinds of LAN standards of frequent employing are supported in this lan emulation, the token ring of promptly press the Ethernet of IEEE802.3 and pressing IEEE802.5, and at this, three frame lengths of support on token ring.Adopt the destination MAC Address of world wide univocality to carry out the addressing at each LAN station.For transmission information between LAN is entrusted by a higher layer.Be the descriptive information approach, token ring lan also adopts so-called route descriptor in addition at frame head except that MAC Address.Adopt a kind of such descriptor frame to be sent to the destination in the inside of token ring lan.
Below read-only MAC-address.
For LAN of emulation in the ATM net, this lan emulation wherein must be resolved into the destination MAC Address destination atm address, realize multicast and broadcasting, just guarantee to give a plurality of or all users, and guarantee with correct sequential delivery lan emulation frame with information distribution.Lan emulation has a kind of client server configuration.Be called lan emulation user LEC and be referred to as the lan emulation business at user side at server side.The lan emulation business is by lan emulation server LES, and broadcasting is formed with unknown server B US and lan emulation configuration server LECS.The lan emulation user for example obtains the destination MAC Address from the LLC layer, and must find corresponding atm address from a last layer, connects so that set up a direct ATM to the destination by the signaling arrangement thereupon.At this, for example can Q.2931/Q.2971 realize signaling by the ITU-T suggestion.Can in each software of standing that participates in lan emulation or hardware, realize the lan emulation user.
A lan emulation server LES is keeping a form, and it has all in emulated lan, for example MAC Address of having declared in the configuration scope and corresponding atm address.Communication between lan emulation user and lan emulation server, carry out according to a kind of lan emulation address resolution protocol, this agreement is represented with LE_ARP by English name LAN Emulation AdressResolution Protocoll (lan emulation address resolution protocol).If a lan emulation user does not know the destination atm address of destination MAC Address, it then sends the inquiry of band destination MAC Address to the LAN-emulation server.With a kind of inquiry that is used for the address decomposition like this of LE_ARPRequest (inquiry) expression.If LES can decompose this destination atm address, it then uses LE-ARP Response (replying) to answer.If can not, it then gives this inquiry other lan emulation user.
If lan emulation user receives that an address is decomposed and reply LE-ARPResponse, the atm address that it then contains bread is here set up a kind of ATM-UBR and is connected, and sends a single-point and broadcast frame.UBR means " Unspecified Bit Rate (Unspecified Bit Rate) " at this, illustrates that just this bit rate is undetermined.It is packets of information or the packet with a single addressee that a single-point is broadcast frame.Within an ELAN, during transmission frame, distinguish multicast frame or broadcast frame that the single-point of giving a recipient is broadcast frame and given a plurality of or all recipients.ATM-UBR connect from the frame of last transmission begin to keep 20 minutes constant so that can other frame be sent to same recipient with plain mode.See also the variable C12 in the 5.1.1 joint of lan emulation performance specification for this reason.By means of cash mechanism (Cash-Mechanismus), the destination atm address storage with the destination MAC Address in the lan emulation user reaches the regular hour.If there is not connection in a destination lan emulation user, and the destination atm address is known in sender's lan emulation user, sender's lan emulation user LEC then shouldn't decompose inquiry and set up a kind of connection in the address, and sends a single-point broadcasting frame.
The multicast frame that mails to one group of user or lan emulation user is fed to above-mentioned BUS with the broadcast frame that mails to all users or lan emulation user LEC.In an ELAN, BUS is keeping leading to the frame that being connected to of all LEC come to the addressee transmission.
Each lan emulation user can the time declare in configuration and is the so-called LEC of agency.Act on behalf of the lan emulation user, receive and all decompose inquiry LE_ARPRequest by the indissoluble address of LES institute.Act on behalf of LEC and receive all multicast frames and all broadcast frames for one in addition.
Between communication parter, can directly connect,, can find out the advantage of atm technology in addition here with frequency bandwidth foundation flexibly.Direct connection is like this guaranteeing the minimum time lag and the high rate of information throughput.In the lan emulation of single-point broadcasting frame, utilize this advantage of atm technology.In article " interconnection emulated lan (InterconnectEmulated LANs with White Area ATM Networks) " with white area ATM net, author Peter T.P.Chang and Bill Ellington ATM symposium technical committee 29 days-December 2 November in 1994, announced different schemes, local ATM-net for example connects ELAN through long distance communication ATM net.In a kind of first scheme, there have a plurality of ELAN to be connected a long distance communication ATM at this to be online, at this, carries out the address through a single lan emulation server and a single BUS and decompose and transfer of data.This scheme causes for realizing the huge traffic of broadcast capability.Be high the lag time that decompose the address in a kind of such net.
Another scheme regulation, each ELAN is passed through long-range bridge circuit (RemoteBridges) separately, and to be connected a long distance communication ATM online.At this, perhaps all long-range bridge circuits are connected to each other by permanent virtual circuit PVC (Permanent Virtual Circuit), perhaps under the condition that adopts an address resolution service device, by means of an atm signaling long-range bridge circuit dynamically are connected to each other.At this, the transmission possibility is limited by the bandwidth of permanent virtual circuit between the transmission possibility of Long-distance Control bridge circuit and two Long-distance Control bridge circuits.As long as the long-range bridge circuit of ELAN is not familiar with the address of the long-range bridge circuit that is subordinated to destination-MAC-address at every turn, long-range bridge circuit is just covered by the broadcasting of long-range each ELAN and the broadcast frame of unknown server.
Another scheme considers that regulation replaces long-range bridge circuit with brouter (Brouter), forms a kind of mixture of being made up of bridge circuit and router.In the case, these brouters satisfy the function of a LAN-emulation bridge circuit in ELAN one side, and satisfy a kind of function of router in ATM telecommunicatio network one side.Reduced broadcast issue thus,, the restriction through ATM long distance net transmission possibility has still been existed by the transmission possibility of brouter and permanent virtual circuit.
Another scheme regulation by direct connection, is connected to each other the lan emulation server of each single ELAN and the BUS of each single ELAN.This causes the high traffic between the BUS of a large amount of direct connections and lan emulation server and each single ELAN.This traffic is at this number linear growth along with connection ELAN.
Another scheme regulation, through connect directly that BUS with the lan emulation server of each single ELAN and each single ELAN is connected on higher level's lan emulation server or higher level BUS on.This causes a large amount of direct connections and the high traffic equally.In addition BUS BUS's or LES's cause time delay with the multilayer of higher level LES with the higher level.
Task of the present invention is to provide a kind of method that transmits packets of information between the destination LEC of the source of ELAN LEC and the 2nd ELAN.
This task solves by a kind of method with claim 1 feature.Favourable design is the object of dependent claims.
If an ELAN planted agent information is transferred to another lan emulation user from a lan emulation user, source LEC arranges to set up an ATM who leads to destination LEC usually and connects.Need the destination atm address for this reason.This source LEC knows a destination MAC Address from higher level.In addition, in its memory, can deposit a destination atm address to this target MAC (Media Access Control) address.If do not depositing the destination atm address, this source LEC then sends address decomposition inquiry LE_ARPRequest to the lan emulation server of ELAN by standard.If the user who is subordinated to this destination MAC Address does not belong to the ELAN of this lan emulation server, this lan emulation server then can not decompose this atm address, just can not answer the address and decompose inquiry.
According to the present invention, this first and second ELAN is connected on the toll network that for example provides as SMDS (exchanging multi-megabit data service Switched Multimegabit Data Service) or the disconnected formula business of CBDS (disconnected formula broadband data service Connectionless Broadband Data Service) (area and/or the whole world).For for simplicity in the back and in the claims, short ofly carry out other explanation, to toll network always in the toll network-just a kind of CLS toll network that refers to provide disconnected formula business (area and/or the whole world).
If the destination MAC Address that should decompose is subordinated at least one lan emulation user of the 2nd ELAN, then can transmit information with following method step by the present invention:
-by providing the CLS toll network of disconnected formula business to decompose inquiry and determine the destination atm address by the atm address that in the 2nd ELAN, the destination MAC Address is resolved into subordinate to the address of the 2nd ELAN transmission sources LEC through one;
-through the higher level ATM net of one first and second ELAN, adopting under the atm address condition of determined destination, arrange to set up between being connected between source LEC and destination LEC; With
-pass on packets of information through higher level ATM net.
Through the CLS toll network determined atm address is decomposed acknowledgement transmissions as the address in one embodiment and give an ELAN, and be transferred to source LEC there, and this source LEC arranges to set up the connection of leading to destination LEC.
At first decompose the destination atm address at this with following method step:
-will decompose in the frame format of a kind of CLS-toll network of inquiry inclosure as the address that the ELAN frame is present among the ELAN, it has the E-164 address that is subordinated to the destination MAC Address in frame header;
-inquiry is decomposed in the address of this inclosure send the CLS toll network to and be transferred to the 2nd ELAN;
The inquiry deblocking is decomposed in-the address that will enclose, and sends the lan emulation server of the 2nd ELAN to the ELAN frame format;
-by this server of the 2nd ELAN the destination MAC Address is decomposed into the atm address of a subordinate, and export an address decomposition and reply;
-this address is decomposed in the frame format of replying inclosure CLS toll network, and be transferred to an ELAN;
-the address that will enclose is decomposed and is replied deblocking and send source LEC to.
If a single destination LEC is subordinated to a destination MAC Address, just have a mind to transmit clean culture and send frame, then according to above-mentioned lan emulation, send an address decomposition inquiry to the lan emulation server of local ELAN from source LEC about the ATM performance specification.Because lan emulation server is only discerned the local atm address, it can not decompose the destination atm address.Therefore the local lan emulation server decomposes inquiry to the address that LEC sends source LEC of acting on behalf of that all are declared in local ELAN.Therefore in a kind of favourable design of the present invention, each single ELAN is connected through a kind of LAN-emulation user of special use respectively to provide the CLS long distance communication of disconnected property business online.This inlet-LEC preferentially declares to acting on behalf of LEC in its ELAN at every turn.
If the destination that should decompose-MAC-address is subordinated at least one LAN-emulation user of the 2nd ELAN, then decompose inquiry by this address of the present invention, be transferred to the 2nd ELAN and be transferred to other each ELAN far away in case of necessity through the CLS toll network.
If each single ELAN is connected when disconnected formula business online is provided through inlet-LEC respectively, then preferentially by being arranged in CLS-toll network (T-reference point) and the passage of fade function IWF (Inter WorkingFunction IWF) foundation between an ELAN and LCS-toll network between inlet-LEC of ELAN separately.A kind of such fade function can be a kind of bridge circuit (Bridge) or a kind of router.
Bridge circuit as fade function, for example have a mutual subordinate MAC Address that is used for ELAN with the CLS toll network addressed memory of address E.164, and have one and be used to be subordinated to by the memory of CLS toll network to the E.164 address of the passage of bridge circuit.
A kind of simple form of implementation of bridge circuit can be stipulated like this, and the address decomposes the inquiry frame and single-point is broadcast and the multicast Frame, when their destination MAC Address is not stored the E.164 address of subordinate in memory, then is rejected; The address decomposes the inquiry frame and single-point is broadcast and the multicast Frame, when their destination MAC Address is stored the E.164 address of subordinate in memory, is then continued to pass on the CLS toll network; And refusing its destination MAC Address is the Frame and the address decomposition inquiry frame of local broadcasting MAC Address.Translation function will belong to the E.164 address of destination MAC Address at every turn with this frame, send to towards the interface of CLS toll network.The E.164 address that translation function will belong to source MAC also sends address decomposition inquiry frame at least to.The frame that comes from the CLS toll network sends the interface (layer LEC) that leads to ELAN to.
A kind of such translation function regulation is merely able to decompose common address decomposition inquiry of leaving the MAC Address of addressed memory in affiliated E.164 address.Therefore have only the address that to decompose reliably to decompose inquiry and enter the CLS-toll network.
In addressed memory, do not deposit under it E.164-address decomposition of the MAC-address of address and inquire if want to decompose yet, then described translation function, can be designed to be convenient to address decomposition inquiry frame and a kind of E.164 address that is subordinated to all ELAN are transferred to the CLS toll network, in addressed memory, under the destination MAC Address that the inquiry frame is decomposed in the address is not deposited E.164 address (the E.164 group address in the whole world).So inquiry is decomposed in a kind of such address, for example then acts on behalf of GAA by the group address of CLS toll network, controlledly sends to all ELAN.Frame is very little because inquiry is decomposed in the address, and the CLS toll network only increases less burden by this measure.
In order to prevent that especially sending single-point in the CLS toll network broadcasts Frame, its atm address once was unknown for source LEC when sending, and thereby arrive inlet LEC through broadcasting and unknown server as the unknown data frame, just can in a kind of conversion of described translation function, stipulate, refuse all single-points and broadcast Frame.Owing to transmit such single-point broadcasting Frame that does not decompose the inquiry frame with the address that is subordinated to atm address through the CLS toll network, this source LEC receives that setting up ATM connects required atm address and can arrange to connect.If find out that by a more high-rise security mechanism existing is the wrong transmission of unknown data frame at least, then can connect the transmission of carrying out repetition through ATM.
A kind of described translation function can preferentially be designed to, and Frame that to be convenient to its destination MAC Address be a global broadcast MAC Address and address are decomposed the inquiry frame and transferred to the CLS toll network.Be subordinated to the E.164-address that herein E.164-address is equivalent to above-mentioned ELAN addressing to all connections.Though the broadcast frame of local is rejected, can be by this measure on purpose through CLS-toll network transmission broadcast frame.
Priority discipline in described translation function, in addressed memory, each storage be subordinated to by the CLS toll network arrive frame the sender MAC Address and be subordinated to its E.164 address.Therefore made things convenient for data, for example an address is decomposed and is replied, through the toll network of disconnected formula business is provided, from a kind of information, the recipient of inquiry is decomposed in for example a kind of address, on purpose is transferred to the sender of this information.
Below describe the present invention by means of special design in detail at figure:
Fig. 1 represent by the CLS net with set up ATM from sender to recipient and be connected and transmit LE_ARP Request/Response (inquire).
Fig. 2 represents to decompose multicast broadcasting-destination MAC Address by the CLS net with setting up to be connected to the ATM of all recipients' point-to-point or point-to-multipoint from the sender.
A kind of protocol stack when Fig. 3 A to 3C is illustrated respectively in by SMDS net or CBDS net coupling ELAN.
(as DQDB, ATM FR) realizes disconnected formula business or CLS business to available different technologies.Having illustrated in ITU-T suggestion F.812 should business.Known implementation method is: the disconnected formula broadband data service (CBDS) of multi-megabit data service of exchange (SMDS) that has illustrated in the performance specification of Bellcore, SMDS special interest group (SIG) and European SMDS special interest group (ESlG) and definition in etsi standard 300217 and ITU-T suggestion I.364.Obtain in the whole world to promote widely by these implementation methods CLS.Many manufacturers of field of telecommunications produce the equipment that this business can be provided.
This business is considered for whole world data communication.Distribute one or more press E.164 the CLNAP address of (E.164-address) (disconnected formula network access protocols of CLNAP=Connectionless Network Aceess Protocol) at this inlet to each communication CLS net.
The single-point of an arrival is broadcast frame, passes through static or dynamic allocation table with its destination MAC Address, adds CLNAP address, a destination (E.164 address) (encapsulation), and guides the frame (also being referred to as the CLS bag) of encapsulation into this CLNAP address.
For the purpose of understanding, following address among the ELAN is called single-point broadcasting MAC Address or multicast/broadcasting MAC Address, in the CLS net, then be referred to as single address and group address on the contrary.
Each CLS wraps in the CLS net and not transmitted by other with influencing.This net is responsible for arranging the correct order of CLS bag.
In the CLS net, under certain prerequisite, (see also prETS 300478,300479), each CLNAP-PDU is enclosed each CLNIP-PDU (the disconnected formula network interface protocols of CLNIP=ConnectionlessNetwork Interface Protocol).
In the CLS net, realize the processing of multicast communication in the following manner.So-called each group address agency (GAA) comprises the form with each the single CLNAP address that belongs to a kind of CLNAP group address.Each has the CLS bag of a group address as destination-address, is drawn towards corresponding group address agency.If packed, same group address then appears in field " CLNAP DestinationAddress (CLNAP destination-address) " and " CLNIP Destination Address (CLNIP destination-address) ".
This GAA resolves into single CLNIP address with the group address that the CLS that arrives wraps, the copy of generation source bag, and add corresponding individual address as the CLNIP address for each copy.
The recipient should " CLNAP destination-address " field remain unchanged, so that can be known the group address in source.The LAN of a single emulation of lan emulation explanation.The solution of each ELAN of overcoupling is not disclosed at present.For efficiency reasons, can not quote the mechanism that in lan emulation, illustrates simply and do the address and decompose and be implemented in multicast/broadcasting in the WAN scope.
Below the be coupled method of ELAN of the present invention is used in explanation:
First example regulation comes the transport address to decompose inquiry by the net that disconnected formula business is provided, or the address decomposes and reply LE_ARP Request/Response, is connected with the ATM-that regulation is subsequently set up from sender to recipient.
An advantage of lan emulation is, between transmitter and receiver, set up a direct ATM-and be connected, as it in LAN-simulation performance specification with " Data Direct VCC " institute's mark.Therefore, this example of the present invention further develop suggestion, adopt a kind of net that disconnected formula business is provided, for example SMDS or CBDS, the destination MAC Address of single-point being broadcast communication resolves into atm address, and sets up a direct ATM-connection of leading to the destination subsequently.
Fig. 1 and 2 represents three kinds of ELAN ELAN1 with the same manner, ELAN2 and ELAN3, they have separately: a LAN-emulation server LES, an atm switching apparatus ATMS, a lan emulation user LECA, LECB, the lan emulation user LECZ1 of a LECC and a special use, LECZ2, LECZ3, the latter is referred to as inlet LEC following, and it makes separately ELAN ELAN1 through a subscriber connecting equipment CPE (Customer PremisesEquipment), ELAN2 or ELAN3 can enter one and illustrate equally, and the network C Lsnet of disconnected formula business is provided.At this, assign a fade function (Interworking Function IWF IWF) for each subscriber connecting equipment CPE, in order to the destination MAC Address is converted to the E.164 address of the subscriber connecting equipment CPE of lan emulation user place ELAN, assign the destination MAC Address for this user, perhaps in order to change one of all ELAN E.164 group address.In pressing the embodiment of Fig. 1 and 2, net realization by means of the higher level with atm switching apparatus ATMS (the space higher level i.e. area or global) ATM, the network C LSnet of disconnected formula business is provided.The implementation that can provide disconnected formula business network CLSnet is to not influence of the present invention.
In addition, ELAN1 is shown respectively in Fig. 1, the broadcasting of ELAN2 and ELAN3 and unknown server B US1, BUS2, BUS3.Transboundary square frame is represented as passing through one, in the example that illustrates, enter the mouth LEC, translation function IWF and a kind of bridge circuit of each self-forming of subscriber connecting equipment CPE, and its bridging functionality is translation function IWF.
Providing the network C LSnet of disconnected formula business to comprise one provides server (Connectionless Server) CLS of disconnected formula business and a group address to act on behalf of GAA (Group-Address-Agent).
In Fig. 1, the transfer address decomposition inquires that it is to represent by the fine rule of a band directions of signal flow arrow that the signal flow of replying LE-ARP Response is decomposed in LE_ARPRequest and address in the scope of LAN-emulation address resolution protocol LE ARP (LAN EmulationAddress Resolution Protocoll).To the flows of data signals of lan emulation user LEC B through an ATM-connection, is to represent by the thick line of a band directions of signal flow arrow from lan emulation user LECA in Fig. 1.
Can in Fig. 1, find out by this,, and through atm switching apparatus ATMS inquiry LE_ARP Request is decomposed in an address therefrom and be transferred to inlet LEC LECZ1 through the atm switching apparatus ATMS of this ELAN1 lan emulation server from the lan emulation user LEC A of ELAN1 to ELAN1.The address decompose inquiry LE_ARP Request from inlet LECLECZ1 to subscriber connecting equipment CPE, it converts another form there to, and be transferred to group address through a disconnected formula server CLS, an atm switching apparatus ATMS and another disconnected formula server CLS and act on behalf of GAA, and directly send the subscriber connecting equipment CPE of ELAN3 and the subscriber connecting equipment CPE that sends ELAN2 through another atm switching apparatus ATMS and another disconnected formula server CLS to therefrom to.Inquiry LE_ARPRequest each back warp inlet LECLECZ2, LECZ3 and lan emulation server LES that is transferred to ELAN through the atm switching apparatus ATMS of ELAN at each ELAN ELAN2 and ELAN3 decomposed in the address then.The lan emulation server LES of ELAN2 can be decomposed into atm address with the destination MAC Address, and through the subscriber connecting equipment CPE of atm switching apparatus ATMS, inlet LECLECZ2, ELAN2, provide the inlet LEC LECZ1 of subscriber connecting equipment CPE, ELAN1 of two disconnected formula server CLS, ELAN1 of disconnected formula business network CLSnet and the atm switching apparatus ATMS of ELAN1 to send lan emulation user LECA to.
If lan emulation user LEC A understanding destination atm address, it then can set up the directly connection of the destination lan emulation user LECB that leads among the ELAN2 through the atm network of being represented by a large amount of atm switching apparatus ATMS in Fig. 1, as its thick line by between lan emulation user LECA and lan emulation user LECB in Fig. 1, and each the atm switching apparatus ATMS that is connected on therebetween is represented.
This process below is described in detail in detail.
Each emulated lan ELAN1, ELAN2, the lan emulation user LECZ1 of ELAN3, LECZ2 or LECZ3 have and lead to the inlet (CPE) that the network C LSnet of disconnected formula business is provided.If desiring to send a single-point to the lan emulation user LECB of ELAN2, the lan emulation user LECA of ELAN1 broadcasts frame, be not familiar with the destination atm address, it then sends an address to the lan emulation server LES of ELAN1 and decomposes inquiry LE_ARP Request.If the lan emulation server LES of ELAN1 does not have the clauses and subclauses of destination MAC Address in its form, it then must decompose this address the inlet LEC LECZ1 that inquiry LE-ARP Request hands to ELAN1.This can be for example realizes by declaring as the agency at the lan emulation server LES place of ELAN1 of inlet LEC LECZ1.
The inlet LEC LECZ1 of ELAN1, as all the other inlet LEC LECZ2 of other emulation ELAN ELAN2 and ELAN3, LECZ3 is connected on the subscriber connecting equipment CPE that disconnected formula business network CLSnet is provided separately.Realize LECZ1 at this by means of a kind of above-mentioned and fade function IWF that describe in detail below (Interworking Function IWF) from inlet LEC, LECZ2, LECZ3 leads to the passage that the network C LSnet of disconnected formula business is provided, this function arrives each in an inlet LECLECZ1, LECZ2, LECZ3's, and this fade function IWF on purpose decomposes inquiry LE_ARP Request in the address of MAC Address clauses and subclauses (E.164 address) to it, or LE_ARP Response is replied in the address decomposition, convert the form of the bag (CLNAP bag) that disconnected formula business network CLSnet is provided to, and will inquire or reply and hand to the network C LSnet that disconnected formula business is provided.
If fade function does not have clauses and subclauses, it then is not that the refusal address is decomposed inquiry or address and decomposed that to reply be exactly to be equipped with E.164-group address to this frame, can arrive all emulation by this group address, have and lead to the LAN that disconnected formula business network CLSnet inlet is provided.Under the situation that the latter mentioned, a group address is acted on behalf of GAA (Group-Address-Agent) this group address is resolved into each single ELAN, ELAN1, ELAN2, each independent E.164-address of each unique user connection device CPE of ELAN3.
At this, if make an addition to the E.164 group address that the address decomposition is inquired or the address decomposition is replied by a fade function, comprise all emulated lan ELAN2 at every turn, the E.164 address of the subscriber connecting equipment CPE of ELAN3, and these emulated lans are the words that are connected on the network C LSnet that disconnected formula business is provided, this then is especially favourable, but except the E.164 address of the subscriber connecting equipment of ELAN ELAN1 itself.
This group address is acted on behalf of GAA and is decomposed E.164 group address, and will have the address and decompose the copy of the bag of inquiry LE_ARP Request and give each single ELAN ELAN2, described group of the subscriber connecting equipment CPE of ELAN3.All thus inlet LEC LECZ2, LECZ3 receives this address decomposition inquiry LE_ARP Request through the transition function.Each LECLECZ2 that enters the mouth, LECZ3 are identified as the address with frame type and decompose inquiry, and therefore this frame are sent to its emulated lan ELAN2 or the lan emulation server LES of ELAN3.Arbitrary lan emulation server LES can broadcast the destination MAC Address with the single-point of destination MAC emulation user LECB usually and be decomposed into atm address.
If inquiry LE_ARP Request is decomposed when encapsulation in the address, added the E.164 address of the subscriber connecting equipment CPE of outlet ELAN ELAN1 by fade function, if when decomposing the inquiry deblocking in the address, E.164, the outlet of the address being decomposed inquiry is stored in the user entry equipment CPE of ELAN2 the address, and encapsulation from the lan emulation server LES of ELAN2 through inlet-LEC LECZ2 under the situation that the address decomposition that the subscriber connecting equipment CPE of ELAN2 delivers is replied, export this E.164 that the address makes an addition to when providing disconnected formula business network CLSnet to answer the head of transmission package, then especially advantageously designed the address and decomposed the loopback of replying.Therefore can the subscriber connecting equipment CPE that LE_ARP Response directly is transferred to ELAN1 be replied in the address decomposition of packing forms by the network C LSnet of a disconnected formula business is provided.
Reply LE_ARP Response by after the fade function deblocking in the address decomposition, the inlet LEC LECZ1 in outlet ELAN ELAN1 replys this address decomposition and is transferred to outlet LEC LEC A.After outlet LEC LECA received that LE_ARP Response is replied in the address decomposition that has the destination atm address, it set up a direct ATM connection of leading to destination LEC LECB through regional or global atm network.
For the described method of the ELAN that realizes being used to being coupled, need in existing LAN-simulation performance standard, not change.Need only an inlet LEC be declared at lan emulation server LES place is to act on behalf of at every turn, and is connected on the network C LSnet that disconnected formula business is provided through a subscriber connecting equipment CPE.This inlet LEC is then from corresponding emulated lan ELAN1, and ELAN2, the lan emulation server LES of ELAN3 receive the address decomposition inquiry LE_ARP Request of all dont answers.
Also have the existing network that disconnected formula business is provided, for example SMDS or CBDS neither must change standard and also must not change performance specification.Only must in this network, define one and have that all are independent, can arrive the E.164 group address of the CPE address of each emulated lan by them.At this, in case of necessity a kind of mechanism can be set, it gets rid of the addressing of the subscriber connecting equipment CPE that is sending.
One second, the example that the connects regulation that describes in detail with Fig. 2 in the back, the ATM from sender to recipient that and set up point-to-point or puts multiple spot by the CLS network is connected to come multicast/broadcasting destination MAC Address is done the address decomposition.
In these basic ideas be, know a plurality of reception lan emulation user LECB by the LE_ARPRequest of multicast/broadcasting MAC Address, the ATM that the atm address of LECC and to this lan emulation user LECB, LECC are set up point-to-point or point-to-multipoint connects.
Fig. 2 represents the consolidated network configuration as Fig. 1.The signal flow that inquiry LE_ARP Request is decomposed in the address carries out in the identical mode of doing as interrelating with Fig. 1 of explanation.Because will decompose the multicast MAC-address of its group membership for lan emulation user LECB and LECC among ELAN ELAN2 and the ELAN3, so not only as in the example of Fig. 1 explanation, from the lan emulation server LES of ELAN2, and decompose to address of the transmission of the source LEC LECA among ELAN1 from the LES of ELAN3 and to reply LE_ARP Response.After receiving that LE_ARP Response is replied in all addresses decomposition, arrange being connected of the point-to-multipoint of foundation from source LEC LECA to LAN-emulation user LECB and LECC.Is to connect the thick line set up direction arrow and represent by having at the network internal establishment of connection at this.
As in precedent, for realizing example with Fig. 2 explanation, inlet LEC LECZ1, LECZ2, LECZ3 is each its ELAN ELAN1 of leisure also, ELAN2, the lan emulation server LES place of ELAN3 declare and are the agency to decompose inquiry so that obtain all addresses of failing to reply from lan emulation server LES.
The example that is different from the front decomposes a multicast/broadcasting MAC Address at this.The lan emulation performance specification forbids sending LE_ARP Requests in the hope of decomposing the multicast MAC Address.This restriction must be removed.
Broadcasting MAC Address 48 * " 1 ", promptly the LE_ARP Request of 48 multiplier words " 1 " provides the atm address of locally broadcast and unknown server B US.In addition, must define a global broadcast MAC Address, can inquire that by it all hang over the whole lan emulation users of the ELAN on the CLS network.
Below briefly comment translation function (IWF) IWF.
This IWF realizes that be being connected of CLS network for " inlet LEC " with opposite side between a side.Be used for IWF by CLS network coupled ELAN and handle MAC Address and address E.164, and should be subordinated to by layers 2 of OSI-reference model.IWF is an ELAN-CLS bridge circuit in other words.
If IWF also should satisfy routing function, it also can processing layer 3 addresses (for example IP, IPX or the like).But this is dispensable to realizing method of the present invention.
At Fig. 3 A, represent the protocol stack of coupling ELAN in the example of 3B and 3C separately by SMDS net or CBDS net.In the example of pressing Fig. 3 A, use the DQDB technology and pressing in the example of Fig. 3 B and realizing the SMDS business with atm technology.In the example of pressing Fig. 3 C, realize the CBDS-business with atm technology.
IWF has following task: I. provides following parameters: recipient address E.164 I.1.
IWF must manage the form with MAC Address and corresponding E.164 address for this reason.For example adjust clauses and subclauses in the form with network management, but also can be with E.164 address filling and after the regular hour, removing of sender's MAC Address of the CLS bag that arrives and sender.I.2. sender address E.164
This is the E.164 address of IWF.II. corresponding to destination MAC Address processed frame: II.1 to the single-point broadcasting/multicast LE_ARPRequests/Responses that does not have clauses and subclauses, or be rejected, or be equipped with the E.164 broadcasting group address in a whole world, and guiding CLS network.II.2. it single-point broadcasting/multicast LE_ARPRequests/Responses that exists clauses and subclauses is handed to the CLS network.II.3 gets rid of the frame with spot broadcasting MAC Address (data and LE_ARP Requests).II.4 and is directed to the CLS network to the E.164 group address in the whole world in the single-point broadcasting/multicast LE_ARPRequests/Responses outfit that has the global broadcast MAC Address.
For realizing that the present invention has only LE_ARP Requests/Responses is important.
For disconnected formula business is " exchanging multi-megabit data service " SMDS and when being used to realize that this professional toll network is the situation of " distributed queue dual bus " DQDB, be used to receive first embodiment of translation function between the aforementioned toll network that disconnected formula business is provided between an ELAN and to stipulate, provide protocal layers in toll network one side.-smds interface protocol layer 1, SIP_1 ,-smds interface protocol layer 2, SIP_2 and-smds interface protocol layer 3, SIP_3, and translation function is from toll network one side and smds interface protocol layer 3, SIP_3, communication.
For example can stipulate protocal layers-physical layer at this, PHY ,-Asynchronous Transfer Mode layer, ATM in ELAN one side,-Asynchronous Transfer Mode adaptation layer-5, AAL5 and-the lan emulation client layer, LEC, use the lan emulation client layer in this translation function in ELAN one side, LEC, communication.
In another example, disconnected formula business can be a kind of " exchanging multi-megabit data service " (SMDS), with realize that this professional CLS toll network can be an atm network, at this, in toll network one side, protocal layers have been stipulated, physical layer, PHY, the Asynchronous Transfer Mode layer, ATM, the segmentation of Asynchronous Transfer Mode adaptation layer-3/4 and compilation sublayer, AAL3/4SAR, with smds interface protocol layer 3, SIP_3, and at this in toll network one side, translation function is used smds interface protocol layer 3, SIP_3 communication.
In other a example, disconnected formula business can be " disconnected formula broadband data service " CBDS, and realize that this professional toll network can be an atm network, decided protocal layers-physical layer at this at toll network one side mark, PHY,-Asynchronous Transfer Mode layer, ATM ,-Asynchronous Transfer Mode adaptation layer-3/4, AAL3/4, an and disconnected formula network access protocol layer, CLNAP, and at this in toll network one side, translation function is used disconnected formula network access protocol layer, CLNAP, communication.
：AAL ATMATM BUS CBDS CLNAP CLNIP CLNP CLS /CPE CRC DQDB DS1 1DS3 3E1 1E3 3ELAN ESIG SMDSDTSI FR GAA IEEE IP IPX IrrU-T -IWF L3_PDU 3LAN LE_ARP LANLEC LANLECS LANLES LANLLC MAC OSI PDU PHY SIG SMDSSIP_3 SMDS3SMDS SPX TCP TP UBR WAN
Claims (10)
1. between the first emulated LAN source emulation user and the second emulated LAN destination emulation user, be used to transmit the method for packets of information, have following method step:
-by being decomposed inquiry, source emulation user's address provide the toll network of disconnected formula business to be transferred to second emulated LAN through one, and in second emulated LAN, destination medium access control address is decomposed into the asynchronous transfer mode address of subordinate, determines asynchronous transfer mode address, destination;
-adopt asynchronous transfer mode address, determined destination, arrange to set up being connected between source emulation user and destination emulation user through higher level's ATM network of first emulated LAN and second emulated LAN; With
-transmit packets of information through this higher level's ATM network.
2. press the method that between the destination emulation user of the source of first emulated LAN emulation user and second emulated LAN, transmits packets of information of claim 1, it is characterized in that, when described destination emulation user is single user, for determining asynchronous transfer mode address, destination, emulation user in source sends an address decomposition inquiry to an emulation server of first emulated LAN, this is decomposed inquiry by the address that any emulation server of first emulated LAN can't decompose, a Web portal equipment through first emulated LAN is imported the toll network that disconnected formula business is provided for transmission, and inquiry is decomposed in this address that is transferred to second emulated LAN, gives an emulation server of second emulated LAN through a Web portal device transmission.
3. press the method that between the destination emulation user of the source of first emulated LAN emulation user and second emulated LAN, transmits packets of information of claim 1, it is characterized in that, described destination emulation user is single user and when belonging at least one described second emulated LAN, in order to determine asynchronous transfer mode address, destination, emulation user in source sends address decomposition inquiry to a server of the LAN simulation business of first emulated LAN, inquiry is decomposed in this address that can't decompose in first emulated LAN, the toll network of disconnected formula business is provided for transmission input through the Web portal equipment of first emulated LAN, and inquiry is decomposed in the address that will be transferred to each emulated LAN of each destination emulation user, through a Web portal equipment, be transferred to a server of the LAN simulation business of each emulated LAN in these emulated LANs separately.
4. press the method for claim 3, it is characterized in that, input is provided the address of the toll network of disconnected formula business decompose inquiry, transfer to a group address agency of the toll network that disconnected formula business is provided, so that determine institute on purpose emulation user's each of each emulated LAN provide separately the toll network link address of disconnected formula business and thereupon the transfer address decompose inquiry to these emulated LANs.
5. press the method for one of aforementioned claim, it is characterized in that, to in second emulated LAN, reply as the address decomposition by decomposing the definite asynchronous transfer mode address of destination medium access control address, toll network through disconnected formula business is provided is transferred to first emulated LAN, be transferred to source emulation user there, and this source emulation user sets up the connection of leading to destination emulation user through the arrangement of higher level's ATM network.
6. press the method for one of claim 2 to 4, it is characterized in that, the emulation user of a special use of regulation, parts as the Web portal equipment in each emulated LAN, it receives all addresses that can't be decomposed by the emulation server institute of each relevant emulated LAN and decomposes and inquire, and it is given the translation function that is defined as bridge circuit at the toll network that disconnected formula business is provided between the relevant emulated LAN with each, this translation function, at every turn will be from the next frame of affiliated emulated LAN, be converted to the frame format of toll network, with these bags are handed to the toll network that disconnected formula business is provided, and this translation function, to mail to the packets of information of the emulated LAN that is subordinated to translation function by the toll network that disconnected formula business is provided, convert the emulated LAN frame format to, and they will be given special emulation user.
7. by the method for claim 6, it is characterized in that translation function will decompose the inquiry frame from the address that affiliated emulated LAN comes and acknowledgement frame is decomposed in the address, by their following processing of destination medium access control address:
-refusal does not exist the address decomposition inquiry and the address decomposition of clauses and subclauses and replys; With
-the address that will exist clauses and subclauses in translation function is decomposed inquiry and address decomposition and is replied and hand to the toll network that disconnected formula business is provided.
8. by the method for claim 6, it is characterized in that translation function will decompose the inquiry frame from the address that affiliated emulated LAN comes and acknowledgement frame is decomposed in the address, by their following processing of destination medium access control address:
-reply the group address that configuration provides the toll network of disconnected formula business for the address decomposition inquiry and the address decomposition that do not exist clauses and subclauses, and transfer to the toll network that disconnected formula business is provided, at this, this group address is connected the online emulated LAN addressing of long distance communication that disconnected formula business is provided to all.
-the address that will exist clauses and subclauses in translation function is decomposed inquiry and address decomposition and is replied and hand to the toll network that disconnected formula business is provided.
9. by the method for claim 6, it is characterized in that the Frame that translation function will be come from affiliated emulated LAN is by their following processing of destination medium access control address:
-refusal does not exist the Frame of clauses and subclauses in translation function;
-the Frame that will exist clauses and subclauses transfers to the toll network that disconnected formula business is provided.
10. by the method for claim 6, it is characterized in that translation function is always refused to broadcast Frame from the single-point that affiliated emulated LAN comes.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
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| DE19524504.0 | 1995-07-05 | ||
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| DE19536269 | 1995-09-28 |
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| EP (1) | EP0836776A1 (en) |
| CN (1) | CN1078997C (en) |
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Families Citing this family (34)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2287376C (en) | 1997-04-25 | 2003-06-17 | Nortel Networks Corporation | Method and apparatus for atm address resolution |
| US6243383B1 (en) | 1997-12-01 | 2001-06-05 | Nortel Networks Limited | Method and apparatus for ATM address resolution |
| CA2217315A1 (en) * | 1997-10-03 | 1999-04-03 | Newbridge Networks Corporation | Service management of multiple independent forwarding realms |
| DE19801773A1 (en) * | 1998-01-19 | 1999-07-22 | Siemens Ag | Service quality criterion mapping method for communication network |
| US6512772B1 (en) * | 1998-02-12 | 2003-01-28 | Hitachi, Ltd. | ATM-address resolving transmission apparatus |
| US6301252B1 (en) * | 1998-04-16 | 2001-10-09 | Mantra Communications Incorporated | Control and management of ATM networks from server computers |
| US6223149B1 (en) * | 1998-05-28 | 2001-04-24 | 3Com Corporation | Non-distributed LAN emulation server redundancy method |
| US6269076B1 (en) * | 1998-05-28 | 2001-07-31 | 3Com Corporation | Method of resolving split virtual LANs utilizing a network management system |
| US6345055B1 (en) * | 1998-09-15 | 2002-02-05 | International Business Machines Corporation | Method and system for providing interoperability between network clients having different versions of local-area network emulation user network interface within an asynchronous transfer mode emulated local-area network |
| JP2000155736A (en) * | 1998-11-24 | 2000-06-06 | Nec Corp | Method for distributing service request and address converting device |
| US6671279B1 (en) * | 1999-02-24 | 2003-12-30 | Nortel Networks Limited | Establishing shortcuts in a Multiprotocol-over-ATM system |
| US6614792B1 (en) * | 1999-05-27 | 2003-09-02 | 3Com Corporation | Proxy MPC for providing MPOA services to legacy lane clients in an asynchronous transfer mode network |
| DE50013558D1 (en) * | 2000-02-23 | 2006-11-16 | Tektronix Berlin Gmbh & Co Kg | Device for constructing a protocol stack and associated method |
| US7092390B2 (en) * | 2000-09-07 | 2006-08-15 | Sbc Technology Resources, Inc. | Internal substitution bi-level addressing for compatible public networks |
| US20020057676A1 (en) * | 2000-10-26 | 2002-05-16 | Beni Cohen-Adiv | Method and system for communicating ISDN over ATM-based next generation access networks using primary rate interface |
| US7546369B2 (en) | 2000-12-21 | 2009-06-09 | Berg Mitchell T | Method and system for communicating a request packet in response to a state |
| US7512686B2 (en) | 2000-12-21 | 2009-03-31 | Berg Mitchell T | Method and system for establishing a data structure of a connection with a client |
| US7287090B1 (en) * | 2000-12-21 | 2007-10-23 | Noatak Software, Llc | Method and system for identifying a computing device in response to a request packet |
| US20020116397A1 (en) | 2000-12-21 | 2002-08-22 | Berg Mitchell T. | Method and system for communicating an information packet through multiple router devices |
| US7418522B2 (en) * | 2000-12-21 | 2008-08-26 | Noatak Software Llc | Method and system for communicating an information packet through multiple networks |
| US6822947B2 (en) * | 2001-02-02 | 2004-11-23 | Telefonaktiebolaget L M Ericsson (Publ) | Radio network emulator for a packet core network |
| US6834311B2 (en) * | 2001-04-04 | 2004-12-21 | Sun Microsystems, Inc. | Method, system, and program for enabling communication between devices using dynamic addressing |
| US6961775B2 (en) * | 2001-04-04 | 2005-11-01 | Sun Microsystems, Inc. | Method, system, and program for enabling communication between devices using different address formats |
| US20030023739A1 (en) * | 2001-07-28 | 2003-01-30 | Lan Ngoc Vu | System and method for multi-tier multi-casting over the Internet |
| AU2003207617A1 (en) * | 2002-01-22 | 2003-09-02 | Sharp Laboratories Of America, Inc. | Systems and methods for acknowledgement of multi-cast traffic |
| DE10207976B4 (en) * | 2002-02-25 | 2004-04-15 | Siemens Ag | Method for establishing a cross-network connection and network gateway device for implementing the method |
| US7301951B2 (en) * | 2002-07-31 | 2007-11-27 | At&T Knowledge Ventures, L.P. | Resource reservation protocol based guaranteed quality of service internet protocol connections over a switched network |
| US7065092B2 (en) * | 2002-07-31 | 2006-06-20 | Sbc Properties, L.P. | Resource reservation protocol based guaranteed quality of service internet protocol (IP) connections over a switched network using newly assigned IP addresses |
| US7298750B2 (en) * | 2002-07-31 | 2007-11-20 | At&T Knowledge Ventures, L.P. | Enhancement of resource reservation protocol enabling short-cut internet protocol connections over a switched network |
| US7272145B2 (en) * | 2002-07-31 | 2007-09-18 | At&T Knowledge Ventures, L.P. | Resource reservation protocol based guaranteed quality of service internet protocol connections over a switched network through proxy signaling |
| US7447203B2 (en) * | 2003-07-29 | 2008-11-04 | At&T Intellectual Property I, L.P. | Broadband access for virtual private networks |
| US7739394B2 (en) * | 2003-07-29 | 2010-06-15 | At&T Intellectual Property I, L.P. | Bi-level addressing for internet protocol broadband access |
| US20050132022A1 (en) * | 2003-12-12 | 2005-06-16 | International Business Machines Corporation | Computer system with LAN-based I/O |
| US7804848B2 (en) * | 2007-02-28 | 2010-09-28 | Cisco Technology, Inc. | Setting a forwarding address in an internet protocol version 6 (IPv6) routing protocol domain at a boundary with a different routing protocol domain |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04107029A (en) * | 1990-08-27 | 1992-04-08 | Mitsubishi Electric Corp | System for connection between local area networks |
| US5379296A (en) * | 1992-12-31 | 1995-01-03 | Unisys Corporation | Method and apparatus for interfacing a workstation to a plurality of computer platforms |
| US5600644A (en) * | 1995-03-10 | 1997-02-04 | At&T | Method and apparatus for interconnecting LANs |
| US5581552A (en) * | 1995-05-23 | 1996-12-03 | At&T | Multimedia server |
| US5812552A (en) * | 1996-03-19 | 1998-09-22 | At & T Corp | Method and apparatus for dynamically forming multimedia emulated local area networks |
-
1996
- 1996-07-01 CN CN96196646A patent/CN1078997C/en not_active Expired - Fee Related
- 1996-07-01 WO PCT/DE1996/001165 patent/WO1997002682A1/en not_active Application Discontinuation
- 1996-07-01 EP EP96921872A patent/EP0836776A1/en not_active Withdrawn
- 1996-07-01 US US08/981,531 patent/US6081836A/en not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| IEEE COMMUNICATION MAGZINE VOL 33 NO 5 1995.5.1 HONGLINHTRUONG LAN EMULATION ON ATM BETWO * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0836776A1 (en) | 1998-04-22 |
| CN1194746A (en) | 1998-09-30 |
| WO1997002682A1 (en) | 1997-01-23 |
| US6081836A (en) | 2000-06-27 |
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